P0118 Engine Trouble Code
What is P0118?
P0118 indicates potential catalytic converter failure. If completely failed, your vehicle may not run properly and fuel economy will suffer significantly. Average replacement cost is $2,000–$2,140. This repair requires professional service and should not be delayed.
Code Information
| Code Type: | OBD-II Powertrain (P) Trouble Code |
| System: | Powertrain |
| Code: | P0118 |
P0118 Symptoms
Check Engine Light
Illuminated dashboard warning
Engine Stalling
Engine stops unexpectedly or misfires
Performance Issues
Reduced power or acceleration
Starting Problems
Difficulty starting the engine
P0118 Code Structure
Understanding what each digit means in the P0118 powertrain trouble code:
| P | 0 | 1 | 1 | 8 |
|---|---|---|---|---|
| Powertrain Code | Intake Valve Control Solenoid Circuit Low | Fuel Rail/System Pressure — Too High | Engine Shutoff Solenoid Malfunction | Clutch Position Sensor Circuit Malfunction |
How to Fix P0118
Diagnostic Steps:
The catalytic converter has oxygen sensors before and after it. When warm and in closed-loop mode, the upstream O2 sensor reading should fluctuate, while downstream should remain steady.
Repair Solution:
Brake switch circuit concerns may involve open or shorted BPP circuits, damaged switches, or misadjustment. Verify stoplight function and follow proper self-test procedures per service manual.
Technical Notes:
P0118 DTC indicating a sensor fault does not always mean the sensor itself is bad. The issue may stem from the systems being monitored or even the sensor wiring. Proper diagnosis is essential.
P0118 Description
P0118 OBD-II Trouble Code: The Engine Coolant Temperature (
Main Cause
The primary reason for P0118 OBD-II Engine Trouble Code is: Fuel Rail/System Pressure — Too High.